Index: kernel/resource.c
===================================================================
RCS file: /var/cvs/linux-2.6/kernel/resource.c,v
retrieving revision 1.4
diff -u -p -r1.4 resource.c
--- kernel/resource.c	28 Sep 2003 04:06:24 -0000	1.4
+++ kernel/resource.c	2 Oct 2003 22:17:40 -0000
@@ -317,6 +317,57 @@ int expand_resource(struct resource *res
 	return 0;
 }
 
+/**
+ * insert_resource - Inserts a resource between two existing resources
+ * @parent
+ * @new
+ *
+ * Returns 0 on success, -EBUSY if the resource can't be inserted.
+ */
+int insert_resource(struct resource *parent, struct resource *new)
+{
+	int result = 0;
+	struct resource *first, *next;
+
+	write_lock(&resource_lock);
+	first = __request_resource(parent, new);
+	if (!first)
+		goto out;
+
+	result = -EBUSY;
+	if (first == parent)
+		goto out;
+
+	for (next = first; next && next->end <= new->end; next = next->sibling)
+		if (new->end < next->start)
+			break;
+
+	/* existing resource overlaps end of new resource */
+	if (next && next->end > new->end)
+		goto out;
+
+	result = 0;
+	if (next) {
+		new->sibling = next->sibling;
+		next->sibling = NULL;
+	}
+	new->child = first;
+	for (next = first; next; next = next->sibling)
+		next->parent = new;
+	if (parent->child == first) {
+		parent->child = new;
+	} else {
+		next = parent->child;
+		while (next->sibling != first)
+			next = next->sibling;
+		next->sibling = new;
+	}
+
+ out:
+	write_unlock(&resource_lock);
+	return result;
+}
+
 /*
  * This is compatibility stuff for IO resources.
  *

.